[RNE Rewrite] feat: add object detection task pipeline

[barhanc]

Description

Adds object detection pipeline implementation and corresponding example screen in computer-vision app.

Introduces a breaking change?

• Yes
• No

Type of change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update (improves or adds clarity to existing documentation)
• Other (chores, tests, code style improvements etc.)

Tested on

• iOS
• Android

Testing instructions

• Build the computer-vision example app on both Android and iOS.
• Test the newly added object detection screen.
• Check the updated HuggingFace repos:
  - https://huggingface.co/software-mansion/react-native-executorch-yolo26

Screenshots

Related issues

Closes #1239

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings

Additional notes